[SAM/CH ZR-1]

I don't think to increase the plenum volume will bring a significant benefit. The intake has to many corners and angels. That restrict the airflow. The size limited trottle body and airhorn are additional air restrictors.

With our racing team we removed on a 350 cui LT5 the plenum and installed single runners and put our eye on the correct runner volume, lenght and shape. With stock compression ratio and stock cams but fully ported heads we got around 580 crank HP at 7'500 rpms. It was our first build LT5 for the 2014 racing season. We did first steps and are satisfied with the results.

For the coming season we design new runners and cam profiles and continue our researches.

I hope to see some of you guys this May in BG.